I have both a datsun and a mustang. BS that you cant work on both. I could, they are easy as hell to work on. You are telling me that you cant make one drivable?!?!?!?
This is how you do it. You drive the Mustang around while you semi complete the Z. Once the Z is running and registered, stop the mustang and work on it. since you have been driving the mustang for a while. You know WTF is wrong with it and fix it. Drive the z for a while and figure out its bugs while you work on the mustang. Once your done with the mustang, then paint the z or whatever you need to do... SIMPLE!!!!
This is how my yard looked...
from this
to this
to this
then both the datsun and mustang ran and we moved to a new location to this
then my brothers 240sx broke down
then my truck broke down again
after I am done with it. The Mustang is next yet again... We just rotate the cars around.
It need alot of work, new window seals, leaf springs, dif, suspension, wheels, tires, some body work etc...